#!/bin/sh
# get-mac-address.sh
# (c) 2006, 2007 Stéphane Alnet
#
# This script is used in /etc/network/interfaces
#
set -e
export LANG=C

iface="$1"
mac=$(/sbin/ifconfig "$iface" | sed -n -e '/^.*HWaddr \([:[:xdigit:]]*\).*/{s//\1/;y/ABCDEF/abcdef/;p;q;}')
which=""

while read testmac scheme; do
        if [ "$which" ]; then continue; fi
        if [ "$mac" = "$(echo "$testmac" | sed -e 'y/ABCDEF/abcdef/')" ]; then which="$scheme"; fi
done

if [ "$which" ]; then echo $which; exit 0; fi
exit 1
